Finally, any \(d > 2\)  dimensional rotation symmetry protected second-order topological phase can be constructed from a \(d=2\)  dimensional second-order topological phase where the corresponding model can be found by using the inverse dimensional reduction map of the isomorphism. The dimensional reduction map can be explicitly expressed in terms of a continuous deformation of the Hamiltonian [1]} or in terms of the scattering matrix of a symmetric boundary [2]}, [3]}.
